Weeping tears of the dragon for the tears of the dragon could become the indestructible shield.

Card Effect(s)

AUTO: CONT: Sentinel(You may only have up to four cards with "CONT Sentinel" in a deck)

[Choose a «Dissidia Fantasy» from your hand, and discard it] When this unit is placed on Guardian Circle, you may pay the cost. If you do, choose one of your «Dissidia Fantasy» that is being attached, and that unit cannot be hit until end of that battle.